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Peanut butter, bees wax, silicone seal, SIlly Putty, bubblegum, 4200, pretty well anything sticky (eewwww) will hold a transducer to a hull.
But a hard epoxy will attain maximum energy transfer, resulting in greater performance and achieving maximum possible range.
If you ever want to remove it, just whack the epoxy/transducer joint with a wood chisel and mallet.
Suspending the tranducer in a tube filled with mineral oil also works well (better than all the lossy adhesives mentioned), but I'm partial to a direct coupling.
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